Writing implements



| P. MARTIN 2,769,427

WRITING IMPLEMENTS Filed Nov. 1'7, 1951 Nov. 6 1

2,769,427 Patented Nov. 6, 1956 Un ed Sa e Pam ofiicfi WRITINGIMPLEMENTS Lynn P. Martin, Fort Madison, Iowa, assignor to W. A.

Sheaifer Pen Company, Fort Madison, Iowa, a corporation of DelawareApplication November 17, 1951, Serial No. 256,897 Claims. (Cl. 120-47)This invention relates to writing implements and has for an object theprovision of a filling device for a writing implement of the fountainpen type. This application is a continuation-in-part of my priorapplication Serial No. 124,328, filed October 29, 1949, now abandoned.

In the filling of ordinary fountain pens with a writing fluid, theconstruction of the pen has ordinarily been such that it is requiredthat the pen nib be completely immersed in a body of the fluid duringthe filling operation in order to insure that a full charge of fluidwill be drawn into the reservoir. Thus when the filling operation iscomplete, there is usually a substantial amount of residual writingfluid adhering to the pen nib which generally must be wiped oflE with acloth or tissue in order to prevent such residual fluid from blottingthe paper or coming into contact with the users hands during a normalwriting operation, Also the excess fluid present in the expansionchambers should be removed by blotting in i order to permit theexpansion chambers to function properly immediately after filling. Theseproblems have long been recognized in the art and various suggestionshave been made for their solution. For example, it has in the past beenproposed that the manufacturer supply replaceable ready-filled inkcartridges in order to eliminate the necessity for the user to fill thefluid reservoir when the fluid is exhausted. Also it has been proposedto fill the fluid reservoir by a separate means extending through therear end of the writing implement, thereby avoiding the direct insertionof the writing nib into the writing fluid during a filling operation.However, these proposals have met with little or no commercial successeither because of the expense involved in supplying separate cartridgeswhen the instrument is to be refilled, or because of the complicationsarising from attempting to fill the fluid reservoir by any means otherthan through the forward writing end.

Accordingly it is one of the objects of this invention to provide afilling device for a fountain pen which may be operated in such a mannerthat the adherence of excess writing fluid to the nib portion of the penis eliminated after the filling operation has been completed.

A further object of this invention is the provision of a filling devicewhich eliminates the necessity of wiping excess writing fluid fromadjacent the nib of the pen after filling has been completed.

A still further object of this invention is the provision of a fillingdevice for a fountain pen which may be adapted to substantially all ofthe commercial forms of fountain pens now being manufactured.

A still further object of this invention is the provision of a new typeof filling device which requires few parts and which may be readilyoperated without undue care on the part of the user. 7

A still further object of this invention is the provision of a fillingdevice for a fountain pen in which the various parts are so arrangedthat the filling device automatically becomes operative during the usualmanipulative steps 2. carried out to condition the instrument for thenormal filling operation but which device automatically returns to anonfilling or inoperative position when the penis reconditioned for useafter filling.

An additional object of this invention is the provision of a fillingdevice for a fountain pen which dispenses with the necessity ofimmersing the pen nib in the writing fluid during filling and in whichthe pen nib and feeding means remain free of excess writing fluid duringand after the filling operation.

A further and additional object of this invention is the provision of afountain pen in which the expansion chambers of the pen are not filledduring the pen filling operation, thus dispensing with the necessity ofdraining the expansion chambers by a blotter or other means afterfilling the pen.

A still further object of this invention is the provision of a fillingdevice for a fountain pen which is normally concealed and does notinterfere with the use of the pen during writing.

A still further object of this invention is the provision of a fillingdevice for a fountain pen in which the fluid feed channels leading tothe writing element are automatically filled with fluid when the pen isconditioned for writing after filling;

A further object is the provision of a reservoir cartridge unit for usein a fountain pen constructed in accordance with a preferred embodimentof this invention.

Further and additional objects will be apparent from the followingdescription, the accompanying drawings and the appended claims. v

In accordance with one embodiment of this invention, the fillingdeviceis incorporated into a writing instrument including a fluidreservoir and a writing element mounted forwardly thereof. The fillingdevice itself comprises an elongated tubular member providingcommunication between the reservoir and an open end of the tubularmember adjacent the writing element. The tubular member islongitudinally reciprocable with respect to the main body portion of theinstrument so that its open forward end may be manually projected for asubstantial distance forwardly of the writing element to a fillingposition and may be manually retracted to a nonfilling positionrearwardly of the writing element. When the tubular member is in theprojected or extended position it is dipped into a writing fluid and thefluid is drawn through it to the reservoir in the usual manner commonlyemployed for filling fountain pens. Thus it is unnecessary to insert thenib itself into the writing fluid during the filling operation. When thetubular member is thereafter reciprocated to the retracted position, theforward end thereof is positioned projected and ofsupplying fluid to thewriting element and simultaneously venting the reservoir as fluid iswithdrawn dun'ng writing when retracted. To achieve this dual purposethe tube includes a pair of longitudinally extending capillarypassageways both of which may serve to conduct fluid to the reservoirduring filling. One of the passageways communicates through a capillaryopening or fissure in a side wall of the tube adjacent the forward endthereof with the writing element of the pen. This passageway constitutesthe fluid feed of the tube. The other passageway, also capillary innature but somewhat larger in cross section, may or may not becontiguous with the first passageway throughout its length 1 andprovides means for permitting air to enter the reser- 'vented to theatmosphere through the filling tube dur ing writing, it will becomeapparent as the description proceeds that feeding and venting may occurthrough other passageways exteriorly of the filling tube. =In such acase, means are usually provided to block off or seal such otherpassageways when the filling tube is projected so that fluid will bedrawn through the filling tube into thereservoir during the fill-ingoperation.

As will be apparent as the description proceeds, the longitudinally.reciprocable tubular member may be reciprocated by any one of a numberof means. For example, the reciprocation may be'etfected by a manuallever extending from the side of the implement or the tubular member maybe reciprocated by means of a hook portion formed on the forwardendthereof cooperating with the rim of a cap of a bottle of writing fluidwhereby the tube may be pulled out to a filling position and thereafterpushed back to a nonfil ling po sition at will. However, in accordancewith this invention it is preferred that the filling tube bereciprocated by a relative turningmotion of two coaxial portions"constituting the casing of the writing implement itself whereby theresulting relative rotary motion is transmitted to the filling tube as alongitudinally reciprocating motion. This translation of motion may belikened to the projection of a writing lead in the usual mechanical typepencil wherein the holder constitutestwo coaxial r 4 Fig. 3 is asectional view taken along the line 3-'3 of Fig. 1; and

7 line 44 of Fig. 1a.

A preferred embodiment of this invention is disclosed in the drawings.This embodiment 'has been adapted to a writing implement having acollapsible sac reservoir of the character disclosed in my Patent No.2,610,612. In accordance with this embodiment there is provided a barrel300 having an'axially rotatable cap 302 mounted on the rear end thereofand a gripping section 304 V threadedly secured to the forward endthereof. An axially bored feed bar 308 isslip-fitted into theiaxial boreof the collar 306 and a sheath type nib 310 surrounding the forward endof the feed bar is threadedly secured to the collar 306. The collar 306and the feed bar 308 in this embodiment provide'a nib support for theimplement. The nib 310 is provided with a longitudinalcapillary fissure312 extending forwardly from a pierce 314 to a writing tip 316 in theusual manner. The feed bar 308' is provided with a plurality of annular.comb cuts or grooves 318 and 320 providing an expansion chamber for theinstrument. In addition the feed bar 308 is provided with an axial bore322 extending throughout parts. efiects a projection or retraction ofthe pencil lead.

This invention has application to the type. of writing implementdisclosed in my copendin-g application Serial No. 80,931, filed March11, 1949, now'PatentNo.

2,610,612. In that application there is disclosed a writing implement inwhich the fluid reservoir comprises a normally distended but collapsible.s-ac which is collapsed by air pressure exerted by a pair oftelescoping tubular members. In the'operation of the device disclosed inthat application, the telescoping tubular members are held in fixedposition While the instrument is in use forward portion of theinstrument as the cap is unscrewed or screwed. Thus in accordance withthisjinvention, .the

filling tube is automatically projected while the instrument is beingconditioned for filling and. the filling tube is automatically retractedafter the filling operation has been completed and the rearward cap isscrewed into 5 place.

For a more complete understanding of this invention; reference willnow'be made to the accompanying drawings in which: X V

Fig. 1 is a longitudinal sectional view of the forward portion of adevice constructed in accordance. with this invention;

Fig. 1a is a broken longitudinal view of the rearward portion of thedevice shown in Fig. 1';

its length. Communicating with this axial bore is -a longitudinallyextending capillary fissure 324 which communicates between the severalannular comb cuts or passage ways 318 and 320 and the capillary fissure312 in the nib 310. Also the feed bar 308 has a scoop cut 326 on theunder surface thereof providing means for venting the expansion chamberformed by the 'comb cuts and passageways 318 and 320. p p a Alongitudinally extending reciprocable filling tube 328 passes throughthe bore 322 and includes an elongated insert 330 having a flattenedside provided with a groove which, in cooperation with the inner sidewallsof the tube, ,forms a vent passageway 332 and a capillary feedpassageway 34' extendingin parallel and contiguous relationshipthroughout the length of the filling tube 328. The vent passageway 332and the capillary feed passageway 334 provide communication between theforward open end of the tube, and theinterior of a collapsible acapillary' annular passageway'340 which is somewhat:-

smaller in cross section than the cap'illary annular passageway 338. Theside wall of the filling tube 328 adjament its forward end and theinsert 330 are slit to Eig.f2 -is a sectional view'taken along-theline'2- 2 provide a capillary slot 342 which communicates between thecapillary feed passageway 334 and the annular capillary passageway 340wherebywriting fluid'is supplied to .the writing point 316 by means ofthe capillary fissure 324 in the feed barand the fissure 312 'in the pennib '310. V I As previously indicated, the filling position (not shown)forwardly of the Writing element 316 and retracted to a position (seeFig 1') rearwardly' thereof. In the embodiment shown in :Figs. 1 through4, the filling tube 328 and the sac reservoirl336 to-.

support the various elements of the cartridge and to hold them inproperalignment. .It will be apparent that the filling tube may bepermanently or removably secured,

a to the'plug. V r r The sheath 344 is provided with'threads 341 a pairof vents 34 s spaced rearwardly thereof, sedan open ehd 7 tube 328 ismounted for reciprocation within the feed ba'r308 whereby the;- forwardend of the tube member may be extended to a.

portion 350. In order to collapse the sac 336 in the manner outlined inmy Patent No. 2,610,612, a plunger tube 352 having an unvented rear endis secured to the cap member 302 and extends in a longitudinallyreciprocable manner into the annular space defined by the barrel 300 andthe protective sheath 344. The rear end of the tubular member 352 isprovided with venting grooves 354 which in cooperation with an aperture356 in the barrel 300 serve to vent thebarrel when the cap 302 is in theposition shown in Fig. la. The usual packing ring 358 is provided topermit the air to compress in order to collapse the sac 336 when theplunger tube 352 is moved forward in the filling operation and asuitable venting aperture 359 is provided on the forward end of the tube352 to vent the barrel when the plunger tube is extended to its mostrearward position for the purposes previously mentioned.

An internally threaded collar member or nut 360 is secured to theforward end of the plunger 352 and is adapted to threadedly engage thethreads 347 on the sheath 344 of the cartridge unit. The cartridge unitis restrained against rotation within the barrel 300 by means of asplined collar 362 having a plurality of peripheral projections 364which are adapted to ride in a plurality of longitudinal grooves 366formed on the inner surface of the barrel 300. This structure permitsthe cartridge unit including the filling tube 328, the reservoir 336,the sheath 344 and the plug 346 to reciprocate axially with respect tothe writing implement but at the same time the cartridge unit is heldagainst rotation. Thus when the cap 302 is rotated, the threaded nut 360in cooperation with the threads 347 on the sheath 344 causes axialseparation of the cap member from the cartridge unit. This axialseparation results in'the movement of the cartridge unit to a fillingtube extended position by virtue of a coil spring 368 compressed betweena stop 370 on the barrel and the rearward surface of the splined member362.

A packing gland 372 is secured within the gripping section 304 and isheld stationary relative thereto. The filling tube 328 reciprocatesthrough the packing gland 72 and the packing gland serves to preventwriting fluid from passing rearwardly of the gland along the outside ofthe tube into space 374 positioned forwardly of the plug 346. It ispointed out that the cap 302 is not itself threadedly secured to therear end of the barrel 309 but merely engages it in slidablerelationship. The threads 376 on the rearward end of the barrel serve nofunction in this modification except in so far as they are an aid in themanufacturing and assembling operations.

It will be apparent from the foregoing description that the penconstructed in accordance with this modification of the invention may bereadily filled without dipping the pen nib or feed bar into the writingfluid. In order to achieve this purpose the cap 302 is manually rotatedwith respect to the barrel 300 causing the axial separation of the capfrom the reservoir section by virtue of the collar 360 riding up thethreads 347, it being borne in mind that the cartridge unit is heldagainst rotation by the splined member 362. As this rotation iscontinued, the spring 368 urges the reservoir section forwardly into thechamber 374 and this continues until such time as the forward surface ofthe splined member 362 abuts a rear end 378 of the gripping section 304.At this point the collar member 360 disengages the threads 347 and theforward end of the filling tube 328 is extended for a substantialdistance forwardly of the writing point 316. The forward open end of thefilling tube is then immersed in a body of writing fluid. Thereafter thecap 302 is pulled rearwardly to condition the implement for filling and,while the filling tube is still immersed in the writing fluid, the capis then pushed forwardly. This movement causes the sac completely tocollapse, as will be understood, followed by distention when the vents354 come into operation. Thus a full charge is drawn up into thereservoir 336 when the cap 302 is returned to its fully retractedposition. Thereafter the cap 302 is rotated in order to withdraw theforward end of the filling tube 328 to the position shown in Fig. 1.

If for any reason the filling tube becomes stuck in the packing gland372 or within the bore of the feed bar, this may easily be remedied. Inthat event initial rotation of the cap 302 will cause it to separatefrom the barrel 300 since the spring 368 cannot force the cartridgeforwardly to the filling tube extended position. After the cap has beenseparated to some extent then manual axial pressure against the cap willassist the action of the spring 368, thus breaking the filling tubeloose from its stuck condition.

An important feature of this invention is the provision of areciprocable filling tube having fluid feed passageways which operate insuch a manner as to take care of a drop of ink which may adhere to theend of the tip of the filling tube after the filling operation has beencompleted. Thus any drop adhering to the end of the filling tube will,when the filling tube is retracted, come into communication with theannular passageway 340. When this occurs the fluid passes by capillaryattraction from the passageway 340 to the capillary fissure orpassageway 324 in the feed bar and to the capillary fissure 312 in thepen nib. Thus this drop of ink which would otherwise be undesirableserves to prime the writing nib even though the nib was completely dryand was not contacted with the fluid in the filling operation. Thus anunbroken column of writing fluid from the reservoir to the pen nib isinsured after the filling operation has been completed.

During normal writing, fluid passes from the reservoir 336 and thecapillary passageways 334, 342, 340, 324 and 312 to the Writing tip 316,as will be understood. The enlarged passageway 332 in the filling tubeserves to vent the reservoir as writing fluid is being withdrawntherefrom. Also both passageways 332 and 334 serve to draw fluid intothe reservoir during the filling operation. In the event that a changein pressure tends to cause expulsion of the writing fluid from thereservoir, this fluid is expelled through passageways 334, 342 and 340to the passageway 324 from whence it overflows into the expansionchamber formed by the comb cuts and grooves 318 and 323. The annularpassageway 338 assists in conducting the fluid to the rearward extremityof the feed bar. The expansion chamber is vented by the scoop cut 326,thereby permitting a substantial amount of fluid to flow around andaccumulate within the grooves 318 and 320. During writing, fluid ispreferentially withdrawn to the writing point from the expansion chamberthrough the fissure 324 before additional fluid is withdrawn from thereservoir since the vent means for the expansion chamber is lessrestricted than the vent passageway 332 for the reservoir. This isadvantageous since it is desired that the expansion chamber be normallyempty in order that it will be ready to accommodate any fluid forcedthereinto on account of pressure changes.

Thus this invention provides a structure in which the pen nib need notbe immersed in the writing fluid during the filling operation and thepen nib and feeding means including the feed bar therefore remain cleanand free of fluid during feeding. Also the expansion chamber is notfilled with fluid during the filling operation and it is empty and readyfor use without the necessity of Wiping it dry with a cloth or blotterafter each filling operation. At the same time a last drop of inkadhering to the filling tube serves to prime the feed channels tocondition the instrument for writing even though previously dry.

It will be apparent from the foregoing that a filling tube has beenprovided which may be adapted for use in connection with many types ofpens now being marketed commercially. Certain features of the fillingtube structure disclosed herein are claimed in my copending appli- 7 a acation Serial No. 368,852 filed July 20, 1953. Further- 'more,' thedevice is particularly adaptable in a type of structure where relativerotation of several-parts of the instrument is normally incident toconditioning it for a filling operation since by this invention thisrelative rotation may readily be employed for extending the filling tubeif desired.

While one particular embodiment of this invention is invention is not tobe limited thereto, since many modifications may be made, and it iscontemplated, therefore, by the appended claims, to cover any suchmodifications as fall within the true spirit and scope of thisinvention.

I claim:

' l. A fountain pen comprising a casing, a feed bar mounted forwardly ofsaid casing having a longitudinal bore extending therethrough, a writingnib mounted on said feed bar, a cartridge unit supported forlongitudinal reciprocation within said casing including an externallythreaded reservoir section and a filling tube rigidly secured to saidsection projecting forwardly thereof and extending through said bore,the forward end of said tube being'movable to positions forwardly andrearwardly of the forward end of said writing nib upon reciprocation ofsaid unit, said filling tube having a longitudinal passageway with anopen forward end providing an unobstructed vent extending therethroughand having a transverse opening in the forward end thereof providingcommunication between the interior of said reservoir section and saidnib when said unit and the forward end of said tube are moved to arearward position, means for restraining said unit against rotation withrespect to said casing, a cap member mounted for rotation on therearward end of said casing, and an internally threaded member securedto said cap member threadedly' engaging said reservoir section wherebysaid unit is reciprocated upon rotation of said cap member relative tosaid casing.

2. A fountain pen comprising a casing, a feed bar mounted forwardly ofsaid casing having'a longitudinal bore extending therethrough, a writingnib -mounted on said feed bar, a rigid cartridge unit supported forlongtudinal reciprocation within said casing, said unit including arigid reservoir section having external threads adja-' cent the forwardend thereof and a fillin tube rigidly secured to said section projectingforwardly thereof and extending through said bore, the forward end ofsaid tube being movable upon reciprocation of said unit to positionsforwardly and rearwardly of the forward end of said writing nib, saidfilling tube having a longitudinal passageway. with an open forward endextending thereextending therethrough and having a transverse opening inthe forward end thereof providing communication bea tween the interiorof said sac and said nib when said unit shown above, it will beunderstood, of course, that the a the forward end of said tube are movedto a rearward 7 position, means for restraining said unit againstrotation with respect'to said casing, a cap member mounted for,

rotation on the rearward end of said casing, and a tubular membersecured to said cap member interposed between said reservoir section andsaid casing having internal I threads adjacent the forward end thereofengaging said external threads whereby said unit is reciprocated uponsheath for said sac having external threads adjacent the 7 forward endthereof, and a filling tube rigidly secured to said sac and said sheathprojecting forwardly thereof and extending through said bore; theforward end of said tube being movable upon reciprocation of said unitto positions forwardly and rearwardly of the forward end ofsaidiwr'iting nib; said'filling tube having a -longitudinal passagewaywith an open forward end providing a vent andathe forward end of saidtube are moved to a rearfor rotation and longitudinal reciprocation onthe rearward end of said casing; and a tubular member secured to saidcap telescopically receiving said sheath andsealingly engaging saidcasing for collapsing said sac when reciprocated from a rearwardposition to a forward position, said tubular member having internalthreads adjacent the forward end thereof for engaging said externalthreads when said cap is moved to a forward position whereby said unitis reciprocated upon rotation of said cap member relative to said casing4. The fountain pen recited in claim 3 wherein said casing includes aforwardly facing stop element and said unit includes a rearwardly facingstop element and wherein a spring member is compressed between said stopelements whereby said unit is urged toward said forward position. I

effective when said threads are in engagement but substantiallyineffective during movement of said cap from a said rearward position tosaid forward position.

6. A fountain pen comprising a casing, a feed bar having an axialpassageway, a writing element mounted'on said feed bar forwardly of saidcasing, a cartridge unit supported for longitudinal reciprocation withinsaid casing, said unit including anexternally threaded reservoir sectionand a filling tube having an open forward end fixed thereto projectingforwardly thereof toward said writing element and spaced therefrom, theforward end of said tube being movable through said axial passageway topositions forwardly and rearwardly of said writing element uponreciprocation of said unit, means secured to said unit for restrainingsaid unit against rotation within said casing, a cap member mounted forrotation on the rearward end of said casing, and an internally threadedmember secured to said cap member threadedly engageable with saidreservoir section whereby said unit 'is reciprocated upon rotation ofsaid cap member'relative to ervoir and for feeding fluid from saidreservoir to said. writing element, said'vent passageway terminating inan unobstructed opening in the forward end of said filling tube, saidfeed passageway terminating in aside wall in the forward end of saidfilling tube, said feed bar having a transverse passageway connectingsaid feed passageway and said writing element when the forward end ofsaid filling tube is moved rearwardly of said writing element. 7. Thefountain pen recited in claim 6 including a resilient member within saidcasing for urging saidunit to the forward position.

i 8. A fountain pen comprising'a casing, a feed bar hav- I ing an axialpassageway, a writingelement mounted forwardly of said casing, acartridge unit supported for longitudinalreciprocation within saidcasing, said unit including a collapsible sac, an externally threadedsheath for said sac, and a filling tube having an open fiorward'endfixed to said saciand projecting forwardly toward said writing elementand spaced therefrom, the forward end of said tube being movable throughsaid axial passageway to positions forwardly and rearwardly of saidwriting element upon reciprocation of said unit, means secured to' saidunit for restraining said unit against rotation within said casing, acap member mounted for rotation on the rearward end of said casing andincluding a pneumatic sac collapsing tubular member sealingly engaging 7said casing and telescopically'mounted for reciprocation over saidsheath, and ,an internally threaded member secured to the forward end ofsaid tubular member threadedly engageable with said sheath whereby saidunit is reciprocated upon rotation of said cap member relative to saidcasing, said filling tube having feed and Vent passageways extendinglongitudinally therethrough communicating with said sac and providingthe sole passageways for filling said sac and for venting said sac andfor feeding fluid from said sac to said writing element, said ventpassageway terminating in an unobstructed opening in the forward end ofsaid filling tube, said feed passageway terminating in a side wall inthe forward end of said filling tube, said feed bar having a transversepassageway connecting said feed passageway and said writing element whenthe forward end of said filling tube is moved rearwardly of said writingelement.

9. A fountain pen comprising a casing, a feed bar having an axialpassageway, a writing element mounted on said feed bar forwardly of saidcasing, a cartridge unit supported for longitudinal reciprocation withinsaid casing, said unit including a reservoir section and a substantiallystraight filling tube having an open forward end fixed theretoprojecting forwardly thereof toward said writing element and spacedtherefrom, the forward end of said tube being movable through said axialpassageway to positions forwardly and rearwardly of said writing elementupon reciprocation of said unit, and means for reciprocably moving saidreservoir and filling tube as a unit within said casing between saidforward and rearward positions, said filling tube having feed and ventpassageways extending longitudinally therethrough communicating withsaid reservoir and providing the sole passageways for filling saidreservoir and for venting said reservoir and for feeding fluid from saidreservoir to said writing element, said vent passageway terminating inan unobstructed opening in the forward end of said filling tube, saidfeed passageway terminating in a side wall in the forward end of saidfilling tube, said feed bar having a transverse passageway connectingsaid feed passageway and said Writing element when the forward end ofsaid filling tube is moved rearwardly of said writing element.

10. A fountain pen comprising a casing, a feed bar mounted forwardly ofsaid casing having a longitudinal bore extending therethrough, a Writingnib mounted on said feed bar, said feed bar having a transversecapillary path connecting said bore and said nib, a cartridge unitsupported for longitudinal reciprocation within said casing including areservoir section and a substantially straight filling tube rigidlysecured to said section projecting forwardly thereof and extendingthrough said bore, the forward end of said tube being movable topositions forwardly and rearwardly of the forward end of said writingnib upon reciprocation of said unit, said filling tube having alongitudinal passageway with an open forward end providing anunobstructed vent extending therethrough and having a transverse openingin the forward end thereof providing communication between the interiorof said reservoir section and said transverse capillary path When saidunit and the forward end of said tube are moved to a rearward position,and means for reciprocably moving said reservoir and filling tube as aunit within said casing between said forward and rearward positions.

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